A sophisticated hacking group recently attacked a U.S. public utility and compromised its control system network, but there was no evidence that the utility’s operations were affected, according to the Department of Homeland Security. DHS did not identify the utility in a report that was issued this week by the agency’s Industrial Control Systems Cyber Emergency Response Team, or ICS-CERT.

Security Debrief is a blog dedicated to homeland security, terrorism and counter-terrorism, intelligence and law enforcement that provides context to the debates, policies and politics that are playing out in Washington, D.C.